A new equilibrium cell featuring a floating piston with an internal variable volume and phase sampling mechanism was designed and commissioned for the measurement of phase equilibrium data. The experimental technique can be extended to the static-combined method. The apparatus was tested by measuring vapor-liquid equilibrium data for the binary system of carbon dioxide + n-hexane at 313.15 K. New experimental vapor-liquid equilibrium data were also measured for the binary systems of carbon dioxide + 1,1,2,2 tetrafluoroethyl 2,2,3,3 tetrafluoropropyl ether at four temperatures, viz. (303.15, 313.15, 323.15 and 333.15) K and modeled using the Peng-Robinson Equation of State. Data close to the mixture critical points were modeled using a scaling law. The average expanded uncertainty for T, P, x₁ and y₁ for all systems in this work were 0.08 K, 0.002 MPa, 0.004 and 0.0007, respectively.

设计并调试了一种新的平衡池，该平衡池具有带内部可变体积和相位采样机制的浮动活塞，用于测量相平衡数据。实验技术可以推广到静态结合法。该装置通过测量二氧化碳 + 正己烷二元系统在 313.15 K 的汽液平衡数据进行测试。还测量了二氧化碳 + 1、1、2 二元系统的新实验汽液平衡数据， 2 四氟乙基 2,2,3,3 四氟丙基醚在四种温度下，即。（303.15、313.15、323.15和333.15）K并使用Peng-Robinson状态方程建模。接近混合临界点的数据使用标度法建模。T , P的平均扩展不确定性，X ₁和ÿ ₁用于这项工作的所有系统分别为0.08 K，0.002兆帕，0.004和0.0007，分别。